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May 22,1922. Y 11,455,224

F. W. POWERS ET AL THERMOSTATIC WATER MIXER Filed 001;. 28, 19,21

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Patentedv May 22A, 1923.

UNrrED STATES- PATENT oFFicl-z.

FRED W. POWERS AND MORTON O. SNEDIKER, OF CHICAGO, ILLINOIS, ASSIGNORS TO THE POWERS REGULATOR C0., 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

'.IIHE'JBNIOSTATICV WATER MIXER.

Application illed Dctober 28, 1921. Serial No. 511,174.

To all whom 'it mayconcem.'

Be it known that we, FRED W. POWERS and MoR'roN O. SNEDIKER, both citizens of the United States and residents of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Thermostatic Water Mixer, of which the following is a specification.

Our invention relates to thermostatically controlled water mixers and particularly to a novel construction adapted to equalize and compensate for variations in pressures of the two fluids to be mixed. v

It is common to employ controllers of different forms for showers and other similar uses in order that water of a predetermined tem erature may be supplied at all times.

Di culty has been experienced, however, in

maintaimng such constant temperatures inview of unavoidable variations in the entrance pressures of the hot and cold fluids to be mixed, and to. that end different forms of reducing valves have been applied to the .supply lines.

One of the objects .of this invention is to y provide a self-contained regulatingunit in lating apparatus and forms an inconspicuous part o'f the regulating unit.

The invention will be more readily understood by reference to the accompanying drawing in which the figure is a vertical sectional view through a regulator constructed in accordance with out invention.

In the drawings it will be seen that we provide a valve casing 10, having seats 11',

l12, surrounding the cold and hot fluid inlet ports respectively. These ports are controlled bya single valve 13, carried by a stem 14, a portion of which stem has an axial opening 15 which, in connection with the lateral passages 16, provides a conduit.

` rounds the bellows.

for liquid .entering through the cold water port to the bottom side of the piston 17,

to the pressure of thecold liquid. A compression spring 20, bears against the .under surface of the piston and rests within a threaded sleeve 21, to which a stem 22 is attached. The stem is packed by means ofthe usual gland nut 23, and is secured at its lower end to a part 24, having a handle 25 connected thereto. A pointer 26 may be associated `with the movable part and may be correlated with temperature indications disposedvon the outer surface of the casting-19.

At its upper end the stem 14 has connected thereto a short section 27, which abuts a plunger 28, the upper end of which is in contact with a vprojection 29, from the. inner wall of a bellows 30. The bellows is contained within a rigid casing 31, and thermostatic liquid is within the casing and sur- Thus the bellows is not subject to the external pressure of the` fluid which passes therearound. The mixed fluids, after passing the valve 13, are directed up-` wardly around the casing 31 and out.

through tlie port 32. The section 27, of the stem is packed'to provide a fluid-tight joint, and a vent opening 33, serves toplace the space above the packingin communication 4with the atmosphere. Thus any liquid which escapes around the stem will be discharged through vthe'vent opening and none of it will enter the bellows.

In operation, the device being suitablyy connected to a source of hot and cold fluids, and the spring 20 being properly compressedl in order to counteract the expansive force exertedA by the thermostatic liquid, the

device will continue to function in the required manner. Y

Whenever any variation occurs in the entrance pressures of the respective fluids, the

variation is instantly effective on one or the other of the ends of the piston, thus unbalancing the same and causin movement of the valve'to restrict the size o the entrance opening for the fluid in which the increase of pres'- sure has taken place. Consequently all disuo l 

